Recording measuring instrument.



F. CONRAD. & P. MAOGAHAN.

RECORDING MEASURING INSTRUMENT.

VAPPLIIOATION FILED MAR. 23, 1906. RENEWED JUNE 15, 1911. 1,031,041

Patented July 2, 1912.

3 SHEETS-SHEET 1.

' H HI'HHHHHHHW! H Y Q-L a ATTORNEY F. CONRAD & P. MAOGAHAN. RECORDING MEASURING INSTRUMENT. APPLIOATION FILED MAR. 23, 1906. RENEWED JUNE 15, 1911.

1,031 ,041 Pa n ed July 2, 1912.

3 SHEETS-SHEET 2.

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RECORDING MEASURING INSTRUMENT.

APPLICATION FILED MAR. 2a, 1906. RENEWED JUNE 15, 1911.

1,031,041. Patented July 2, 1912.

3 SHEETS-SHEET 3.

INVENTORS ATTORNEY WITNESSES:

UNITED STATES PATENT onnien.

mum-x GONRAD'LOF swIssvALE, AND rAUL MAGGAHAN, or wiiixmsiaonarnnnsyn VANIA, Assre'noas n30 WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY,

' [A conrormrion oFPnnNsYLvANIA.

RECORDING MEASURING INSTRUMENT Specification of Letters Patent.

Patented J nly 2 191 2.

Application filed March 23, 1906, Serial No. 307,738. Renewed June 15, 1911. Serial No. 633,347.

To all whom it may concem: I -.Be it known that we, FRANK CONRAD and PAUL MAGGAHAN, citizens of the United Y States, and residents, respectively, of Swiss- 5 vale and of VVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented. a new and" useful Improvement in \Recmfgling-Measuring Instruments, of which to provide such instruments with means OttljlilXGIltlQll. Figli 2 is a View in side elevation and section on tl1e-linelI-II of Figs-1; ,Fig. 3 i s a,diagrammatic view illustrating the circuit connections of the instrument, and Fig, lisla diagrammatic VlQAV of plate 5 and two other coils 6 and that ar'e movable between the opposing faces of the respective airs of stationary coils. The coils 6 and are carried at the opposite ends of a frame 8 that is pivotally supported upon knifeedged bearings 9 by means of hooks 10 that ,depend from a stationary bracket ll. Circuit connections to the movable coils G and? may be made by means of a pair of oppositely coiled spiral springs 12, as is usualjri instruments of this character. will-beread ily understood that the coils may be so constructed and the circuits thereof be so arranged that the instrument may be adapted for operation as a ,volt- /ineter,an ammcter or a wattnieter, as desired. In order to illustrate the mode of operation of" the invention, however, it has been appl ed in Fig. 3 to a voltmeter, all of the coils being connected 1Il series with a rea r s c o sistanc'c l3 and between a pair of circuit conductors 14 and 15. v

The novable member of the instrument carries 'a flexible switch member 16 -commerit, that. is constructed in accordance, with are immogvably secured; to a base or Joackv I prising a pair of resilient strips 17 and 18,

i that are spaced apart'and are secured at one end to a terniinalplaite 19 on thiidge of the coil .6. The free 'en'dof the switch ,me inb'er I is providedwith a contactipiece 'QQ'Ith'at preferably cOI POSed of; silver andfi's i ed to bebrou ht; ifi'itofeng'a' ementfwit the one or th otlier-df, a pair 0 stationary contact terminals 21 and 22 byt-he ngv'gments of the movable member. Tlie'co nta ct terrninals and 22 comprise screws 24 that are threaded in stationary posts or 1 brackets 25 and 26, the'tips' orcontact surfaces of the screws being preferably composed of platinum. It ha s been found by experiment that, when the engaging sur faces of a. circuitv interrupting device are ,composed respectively of silver and p latinum, or other dissimilar metals of substantially the same properties, sticking and welding of the parts will be substantiallyobviated. -Attached to the free end of the: switch member 16 is a piston or movable member 27 of a retarding device, that co1n prises further a cylinder ,or reccptaclcfls containing oil or other suitabl e liquid "in which the member 27 is adapted to operate.

By this.means vibration or b uzzing-oft hel contact terminals Which would otherwise occur when the instrument is employed in connection with alternating curreiitiis substantially obviated while at the same-time undue oscillations and sudden movements of the parts are prevented.

. The brackets 25 and 26 are respectivel connected to terminals of non-magnet wind ings 29- and;30 that surround nagneti zr. able receptaclesBl, containing oil or other suitable liquid in which inagnetizable cores 32 and 33 are adapted to pperate, the movements of the cores and connected, parts being in this ;manner effectively dampedand retarded, The cores 32 and 33 are carried at the opposite ends of a rocking beam 34 that is supported upon a .pivot an and is connected, by means of a helical spring 35,to the frame 8, the spring being of sufiicient strength to balancethe torques n tie-mes w th .w'lll l fl-i il f c d occupy the positions shown in Fig. 1. An arm 36, that extends upwardly from the rocking beam, is pivoted at its outer end to the middle or other point of a link 37 that, he turn, is pivoted at its upper end to another lever 38 having astationary pivot at 39. The movable parts 36, 37, 38 and 42 of the mechanism are balanced, so that they will remain in any position to which they are moved, by means of a weight that is adjustable in position on an arm 41 which extends downwardly from the rocking beam 34. A fountain pen 42 or other suitable means for effecting a record, such as a penoil, iscarried at the lower end of the link 37 and engages a record strip 43 upon the face of a platen roll 44, the parts of the link and lever mechanism being so proportioned" and disposed with reference to each other that the pen will be caused to move in a straight line across the face of the platen roll. The

platen roll is provided at its ends with pro jections 45 that are adapted to register with apertures 40 near the edges of the record strip, which is thereby drawn from a supply roll 47. An idle roll or spindle 48, that is provided at intervals with rubber or other resilient sleeves 49, serves to press the rec- 0rd strip' tightly against the face of the platen roll. The platen roll is adapted to be operated through intermediate gearing by means of a suitable self-winding clock the works of which are mounted in a frame 51, a magnet winding 52 serving to wind or to control the winding of the clock. Since the details of the clock mechanisn'i form no part of the present invention, and since such clocks are well known in the art, it is deemed unnecessary to further show its structure or describe its mode of operation.

\Vhen no current traverses the instrument coils 1, 2, 3, 4, 6 and 7', the parts occupy the positions shown in Fig. 1, and the spring 35 is not under tension. However, when current traverses the said windings, the force exerted between the stationary and movable coils will cause the coil 6 to move downwardly and the coil 7 upwardly and the contact piece 20 on the switch, arm It} will he thereby brought into engagement with the stationary terminal 22 so as to complete the circuit of the magnet winding 30. As here shown, the auxiliary circuits of the instrument aresupplied from a battery 53, though they may be supplied from any other suitable source. such as from the excitcrs for generators, in connection with which the instrnment may be employed. lnergixing of the magnet winding 30 causes the core 33 to be drawn downwardly and the fountain pen to be moved toward the right until the tension exerted upon the spring 3? equals the torque exerted between the stationary and movable coils. The contact pieci- JO on the switch arm it? will thereupon be d sengaged to thr values of the t r-cos m=':=

from the stationary terminal 22 and the parts of the instrument. will remain stationary so long as the forces exerted between the stationary and the novable coils do not vary except that the platen roll will be moved by the clock mechanism so that a line may be made on the strip 43 as. it is moved under the pen point. If the voltage of the circuit increases, the contact piece 20 will be again moved into engagement with the stationary terminal 92 and, as a result, the recording device will be moved farther to the right, but if the voltage of the. circuit decreases the contact piece 20 will be moved into engagement with the stationary terminal 21 and thereupon establish the circuit of the magnet winding 29. This will cause the recording device to be moved to the left until the tension exerted upon the spring 35 is reduced to correspond to the torque exerted between the stationary and movable coils. Thus a continuous record of the values of the forces measured will be made upon the strip 43, and since the recording mechanism is not operated directly by the movable member of the instrument the sensitivencss of the latter is not. impaired by the presence of the recording means.

In order to reduce or substantially prevent sparking caused by the inductive dis charges of the magnet windings 29 and 30 when the circuits thereof are interrupted, condcnsers 54 and are so arranged in circuit with a resistance 56 that whenever the circuit is interrupted the break will be shunted by one of the condensers and the resistance, as shown in Fig. 3. In some instances, however, it may be desirable to arrange the circuits as shown in Fig. 4, in which the magnet windings are shunted rcspectii-"ely by one of the condensers and the resistance. It has been found, when either the condcnscrs or the resistance are employed alone to reduce the cticcts of inductive discharges, that a certain amount of sparking may occur between the disengaging parts, while if both devices are omplowid it will be substantially obviated. The condenser delays and absorbs the discharge while the resistance reduces the amount of current and the voltage of the discharge.

\Vhile the invention has been shown and described as applied to a particular form of instrument it willv be understood that it; is applicable broadly to all forms having movable mem ers and specifically to otlrr inn oditi -miim of the prcwnt inverti-n; is: \\l ich rrcording' inc-ans are ap .0 an str'nnv-nt of 12:. indi ating type; that is, an l!i lllliliillt In which the movtmcnis f-the mo ablemember are pl'tilUl'll lHl in extent A measuring instrument comprising a movable member, a contact terminal carried thereby, a recording mechanism, solenoids and cores for actuating the same, contact terminals which cooperate with that carried by the movable member to control the circuits of the solenoids, and resilient means connecting the recording mechanism and the movable me'mber.

3. A measuring instrument comprising a movable member, a switch member carried thereby, a recording mechanism, magnet windings for actuating the same, contact terminals disposed in the path of movement of the switclrmember to cooperate therewith in controlling the circuits of the sole noids, means for adjusting the positions oi the contact terminals, and resilient means connecting the recording mechanism and the movable member.

4. A measuring instrument comprising a movable member, a parallelqnotion record ing mechanism, solenoids and cores for actuating the same, and means operated by the movable member for controlling the circuits of the solenoids.

5. 'A measuring instrument comprising a movable member, a parallel-motion recording mechanism, solenoids and cores for actuating the same, means operated by the movable member fol-controlling the circuits of the solenoids, and resilient means connecting-the recording mechanism and the movable member.

6. A measuring instrument comprising a movable member, a ,revording mechanism, solenoids and cores for actuating the same, means operated by the movable member for cdntrolling the circuits 'of the solenoids, means for retardiiig the movements of the recording mechanism, and 'resilient means comiecting the recording mechanism and the movable member.

' 7. it measuring Instrument comprising a.

movable member, a recording mechanism, an operating lever therefor, resilient means connecting the movable member and the said lever, solenoids and cores for actuating the same and meansoperated by the ,fnovable member for controlling the circuits of the solenoids.

8. Inameasuring instrument, the combination with immovable member and a circuit-interrupting device operated thereby, of a resistance and a condenser m shunt to,

said interrupting device, recording mecha-.

v a mean and operating solenoids therefor the circuits of which are controlled by said interrupting device.

9. In a measuring instrument, the combination with stationary and movable actuating members and a circuit-interrupting device operated by said movable actuating membeigof a resistance and a condenser in shunt to said interrupting device, recording mechanism and operating solenoids the cirsuits of which are governed by said interrupting device.

10. A measuring instrument comprising a movable member, a parallel-motion beam and lever recording mechanism, solenoids and cores for actuating the same, and means operated by the movable member for controllin the circuits of the solenoids.

11. g measuring instrument comprising a movable member, a parallel-motion beam and lever recording mechanism, solenoids "and cores for actuating the same, means operated by the movable member for. controlling the circuits of the solenoids, and means cooperating with the solenoid cores for retarding the movements of the recording mechanism.

12. A measuring instrument comprising a movable member, a parallel-motion beam and lever recording mechanism, solenoids and cores for actuating the same, means operated by the movable member for controland the recording mechanism.

13. In a measurlng instrument, the comating members, of a pair of solenoids, means operated by the movable actuating member noids, a pivotally supported beam provided with a centering weight and connected to. the cores of the solenoids, and twopivotally connected levers one of which isprovided with a marking device andis pivotally connected to said beam and the other of which is pivotally supported. by the instru ent frame. Y

14. In a measuring instrument; the combination with stationary and movable actuating members, of a pair of solenoids, eans operated by the movable actuating me her to make and break thepircuits of said solenoids, a pivotally supported tieam provided with" a centering Wei ht and connected to the cores of'the solenoids, two pivotally cona markingdevice 'and-is pivdtally connected and a spring between the movable actuating 15. In a-measuring instr'um t, the conibination with a movable 1neri1ber,.a parallel- -motion recording m ha'nism, solenoids and cores fo'r actuating t e same, receptacles for ling the circuits of the solenoids, and resili' ent means connecting the movable member nected'levers one of which isprovided with to said beam and theother of which is pivotally supported by the instrument frame,

member and the pivotally sup orted beam bination with stationary and movable actuto make and break the circuits of said sole-.

fluid in which the cores operate, and means operated by the movable member for controlling the circuits of the solenoids.

16. A measuring instrument comprising a movable member, a beam pivotally mounted intermediate its ends and provided with a laterally projecting arm, a pair of solenoids, cores therefor carried respectively at opposite ends of the beam, a lever pivotally con neeted intermediate its ends to the said lat-- erally plajecting arm, a link pivotally conn cted at one end to one end of the said lever, a marking device actuated by the said In testimony whereof, We have hereunto subscribed our names this 22nd day of March, 1906.

FRANK CONRAD. PAUL lvLxoGAI-IAN. \Vitnesses O'r'ro S. Sormnmn, BIRNEY Il'nvns. 

